The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- .htaccess (2 members)
- 11th hour (2 members)
- 1999 (1 member)
- 2003 (0 members)
- 2004 (0 members)
- 2005 (0 members)
- 2006 (0 members)
- 2007 (0 members)
- 2008 (0 members)
- 2009 (0 members)
- 2016 (0 members)
- 2016 UK Trip (1 member)
- 2017 (1 member)
- 2018 (0 members)
- 2XXfm (3 members)
- 404 Not Found (1 member)
- ABC (2 members)
- ACS (1 member)
- ACT Greens (3 members)
- ANU (6 members)
- ANU School of Art (1 member)
- APIs (1 member)
- A Place of One's Own (12 members)
- A chair in which to sit (3 members)
- Abrolhos Islands (1 member)
- Access to Memory (1 member)
- Activism (2 members)
- Address book (3 members)
- Addressbook plugin (13 members)
- Adnan Issadeen (1 member)
- Aeropress (1 member)
- Air travel (2 members)
- Alain de Botton (1 member)
- Alastair Bonnett (1 member)
- Alcohol (1 member)
- Aldus Huxley (2 members)
- Alternate world (1 member)
- America (2 members)
- And what do you do Mr Gable? (1 member)
- Apple (1 member)
- Applications (1 member)
- Archaeology (1 member)
- ArchiveTeam (3 members)
- Archives (2 members)
- ArchivesWiki (2 members)
- Archiving (22 members)
- Art (2 members)
- Art school (4 members)
- Articles (5 members)
- Artifactory (1 member)